package com.WaVel.aspect;

import com.Emplyment.context.BaseContext;
import com.Emplyment.enumeration.OperationType;
import com.WaVel.annotation.AutoFill;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理的逻辑
 * **/

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("@annotation(com.WaVel.annotation.AutoFill)")
    public void autoFillPointcut(){}


    /**
     * 前置通知，在通知中进行公共字段的赋值
     * **/
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段填充...");
        //获取到当前被拦截方法上数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//获得方法的签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法的注解
        OperationType operationType = autoFill.value();//获得数据库操作类型
        //获取到当前被拦截方法上的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        log.info("方法参数为:{}",args);
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT){
            //为四个公共字段来赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}
